Shades trilogy tops global bestseller lists
El James' trilogy - Fifty Shades of Grey, Fifty Shades Darker and Fifty Shades Freed - tops the New York Times' combined print and e-book fiction list.
The first instalment, Fifty Shades of Grey, has remained at the top of the bestseller list for 19 weeks.
In the UK, Fifty ShadesDarker became the fastest-selling paperback, overtaking authors such as JK Rowling (Harry Potter) and Dan Brown (The Da Vinci Code).
"Last week , the first instalment sold more than 100000 paperback copies - a feat most Harry Potter books and the Twilight novels failed to achieve," wrote The Daily Mail this week.
In the UK, the first novel has been reprinted 17 times.
The Independent newspaper in London reported earlier this month that publishing-trade magazine The Bookseller announced that the first book had sold 1645422 copies in only 12 weeks.
The Da Vinci Code - the best-selling UK paperback of all time - took 46 weeks to reach that figure.